MS-15D Gyan Kai
I had drawn the Mass pro Gyan and had sat on it for 6 months. When I pulled it out and looked at it again, I was disappointed that I didn't do that many changes to it. So I went back to the drawing board and came up with this one. (I must admit that I was inspired by Mark Simmons' M.S. classics ^_^)

Okay, so why MS-15D?

YMS-15 prototype we see in the TV series
MS-15A first mass production version
MS-15B high-mobility ver. (Giren's Greed)
MS-15C cannon ver. (Giren's Greed)

Which leaves the next open letter D. "Kai" is a Japanese term added to mean the object has been changed.

So let's talk about the changes. There is an overall "Katoki-ifying" going on around all the edges. The shoulder things from the my other Gyan ver. have been expanded, giving the Gyan wider shoulders and protection for the shoulder joint. You can see an extra beam saber hilt poking out from behind the Gyan's waist. There is a cylinder to plug both beam sabers into, on the back waist skirt. The beam saber the Gyan is holding would plug into the other side. Finally notice the ankle armor I have turned into really part of the heel of the foot.

After I did this drawing, I looked back at my other Gyan and thought--hey, that's not too bad, so I decided to include both as different versions.